JPS5948331B2 - flame detector - Google Patents
flame detectorInfo
- Publication number
- JPS5948331B2 JPS5948331B2 JP6833878A JP6833878A JPS5948331B2 JP S5948331 B2 JPS5948331 B2 JP S5948331B2 JP 6833878 A JP6833878 A JP 6833878A JP 6833878 A JP6833878 A JP 6833878A JP S5948331 B2 JPS5948331 B2 JP S5948331B2
- Authority
- JP
- Japan
- Prior art keywords
- flame detector
- discharge tube
- circuit
- signal
- time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000825 ultraviolet detection Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000007257 malfunction Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
Landscapes
- Fire-Detection Mechanisms (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Description
【発明の詳細な説明】
この発明は炎感知器、特に火災時等に発生する炎の紫外
線を検出することにより、火災を検出する炎感知器に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flame detector, and particularly to a flame detector that detects a fire by detecting ultraviolet rays from flames generated during a fire.
従来、紫外線を検出する素子として紫外線検知一：ヨ：
一ー＝；外線でも動作することがある。Conventionally, ultraviolet ray detection elements have been used as elements for detecting ultraviolet rays.
1 =; It may also work on an outside line.
また、一度動作すると残留イオンにより続いて放電しや
すい状態（前歴現象）になることがある。このため火災
でない場合にも放電し誤動作するという欠点があつた。
この発明は、このような誤動作を防止する信号処理回路
を設け、信頼性の高い炎感知器を提供するものである。Additionally, once the device is operated, residual ions may cause a state where it is likely to continue discharging (antecedent phenomenon). For this reason, they had the disadvantage that they would discharge and malfunction even in the event of no fire.
The present invention provides a highly reliable flame detector by providing a signal processing circuit that prevents such malfunctions.
次に、この発明の実施例を図面に基づいて詳細に説明す
る。Next, embodiments of the present invention will be described in detail based on the drawings.
この発明の炎感知器は、第１図に示すように発振回路０
５とトランジスタＱ２と変圧器Ｔとから構成される昇圧
回路と、この昇圧された電圧を整流平滑する整流回路Ｒ
ｆと、充電回路を形成する抵抗Ｒ１、コンデンサＣと、
火災時に発生する炎の紫外線を検出する紫外線検知放電
管ＵＶと、この検知出力を取り出す抵抗Ｒ２と、この検
出信号を処理し、火災信号を発する信号処理回路ＳＣと
、信号処理回路ＳＣの信号により昇圧回路の動作を一時
的に停止するトランジスタＱ、とから構成されている。The flame detector of this invention has an oscillation circuit 0 as shown in FIG.
5, a booster circuit consisting of a transistor Q2, and a transformer T, and a rectifier circuit R that rectifies and smoothes this boosted voltage.
f, a resistor R1 forming a charging circuit, and a capacitor C,
An ultraviolet detection discharge tube UV detects ultraviolet rays from flames generated during a fire, a resistor R2 takes out this detection output, a signal processing circuit SC processes this detection signal and issues a fire signal, and a signal from the signal processing circuit SC A transistor Q temporarily stops the operation of the booster circuit.
なお、端子Ｐ、Ｏは感知器線路の電源兼信号線に接続さ
れている。このように構成された炎感知器において、通
常発振回路０５はパルス信号を発生し、トランジスタＱ
２は繰り返しオン・オフする。Note that the terminals P and O are connected to the power supply/signal line of the sensor line. In the flame detector configured in this way, the normal oscillation circuit 05 generates a pulse signal, and the transistor Q
2 turns on and off repeatedly.
変圧器Ｔの一次巻線にパルス電流が流れ、二次巻線には
高電圧（約３００Ｖ）を発生し、整流回路Ｒｆで整流し
、紫外線検知放電管ＵＶに必要な高圧電源を得る。この
高電圧は常時抵抗Ｒ１を通しコンデンサＣに充電される
。火災時に発生する炎の紫外線を紫外線検知放電管ＵＶ
が検出し動作すると、コンデンサＣに充電された電荷を
放電させる。A pulse current flows through the primary winding of the transformer T, and a high voltage (approximately 300 V) is generated in the secondary winding, which is rectified by a rectifier circuit Rf to obtain a high voltage power source necessary for the ultraviolet detection discharge tube UV. This high voltage is constantly charged to the capacitor C through the resistor R1. UV discharge tube that detects ultraviolet rays from flames generated during a fire
When detected and activated, the charge stored in the capacitor C is discharged.
このとき抵抗馬に放電電流が流れ、第２図に示すように
検知信号Ｘを発し信号処理回路ＳＣに入力する。検知信
号Ｘをカウントするか、または積分し所定の値に達する
と信号Ｙが出力され、トランジスタＱ１を時間Ｔｉの間
オン状態にし昇圧回路の動作を一時的に停止し、１度動
作した紫外線検知放電管ＵＶの電源を一定時間Ｔｉ遮断
し、その後再度監視することで前歴現象による影響を少
なくしている。また、信号処理回路ＳＣは、紫外線検知
放電管ＵＶが最初に動作してから時間Ｔ２の間に再度動
作した場合に始めて火災警報信号ｚを発する。なお、時
間Ｔｉ、Ｔ２はＴ２＞Ｔ１の関係に設定されている。以
上で説明したように、この発明の炎感知器は紫外線検知
放電管ＵＶが動作すると、その後一定時間Ｔ１紫外線検
知放電管ＵＶへの電源供給を遮断し前歴現象による影響
を少なくし、再度監視状態にする。At this time, a discharge current flows through the resistor, and as shown in FIG. 2, a detection signal X is generated and input to the signal processing circuit SC. When the detection signal X is counted or integrated and reaches a predetermined value, a signal Y is output, and the transistor Q1 is turned on for a time Ti to temporarily stop the operation of the booster circuit, and the ultraviolet rays that have been activated once are detected. The influence of antecedent phenomena is reduced by cutting off the power supply to the discharge tube UV for a certain period of time and then monitoring it again. Further, the signal processing circuit SC issues the fire alarm signal z only when the ultraviolet detection discharge tube UV operates again during the time T2 after the first operation. Note that the time Ti and T2 are set to have a relationship of T2>T1. As explained above, in the flame detector of the present invention, when the ultraviolet detection discharge tube UV is activated, the power supply to the T1 ultraviolet detection discharge tube UV is cut off for a certain period of time to reduce the influence of the previous phenomenon, and the monitoring state is resumed. Make it.
また、所定の期間内に複数回動作した場合にのみ火災警
報信号ｚを発する信号処理回路ＳＣを設けたことにより
、信頼性を著しく向上することができたので防災上有用
である。Further, by providing a signal processing circuit SC that issues a fire alarm signal z only when activated a plurality of times within a predetermined period, reliability can be significantly improved, which is useful for disaster prevention.
第１図はこの発明の炎感知器の実施例を示す結線図、第
２図は第１図の信号処理回路ＳＣの動作を説明するため
のタイミングチヤートである。
０Ｓ・・・発振回路、Ｑｌ，Ｑ，・・トランジスタ、Ｔ
・・・変圧器、Ｒｆ・・・整流回路、Ｒｌ，馬・・抵抗
、Ｃ・・・コ．ンデンサ、ＵＶ・・．紫外線検知放電管
、ＳＣ・．．信号処理回路。FIG. 1 is a wiring diagram showing an embodiment of the flame detector of the present invention, and FIG. 2 is a timing chart for explaining the operation of the signal processing circuit SC shown in FIG. 0S...Oscillation circuit, Ql, Q,...Transistor, T
...Transformer, Rf...Rectifier circuit, Rl, Horse...Resistor, C...Co. UV... Ultraviolet detection discharge tube, SC・. ．． signal processing circuit.
Claims (1)
紫外線検知放電管の検出動作後に前歴現象が消滅する一
定時間上記紫外線検知放電管の電源供給を遮断する回路
と、上記一定時間より長く設定された所定の時間内に複
数回上記検出動作を行なつた時に火災信号を発する信号
処理回路とを具備したことを特徴とする炎感知器。1. In a flame detector using an ultraviolet detection discharge tube, a circuit that cuts off the power supply to the ultraviolet detection discharge tube for a certain period of time during which the antecedent phenomenon disappears after the detection operation of the ultraviolet detection discharge tube, and a circuit that is set to be longer than the certain period of time. A flame detector comprising: a signal processing circuit that issues a fire signal when the above detection operation is performed multiple times within a predetermined period of time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6833878A JPS5948331B2 (en) | 1978-06-08 | 1978-06-08 | flame detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6833878A JPS5948331B2 (en) | 1978-06-08 | 1978-06-08 | flame detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54160289A JPS54160289A (en) | 1979-12-18 |
| JPS5948331B2 true JPS5948331B2 (en) | 1984-11-26 |
Family
ID=13370947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6833878A Expired JPS5948331B2 (en) | 1978-06-08 | 1978-06-08 | flame detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5948331B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5726075U (en) * | 1980-07-21 | 1982-02-10 |
-
1978
- 1978-06-08 JP JP6833878A patent/JPS5948331B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54160289A (en) | 1979-12-18 |
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